Furnace



Dec. 14, 1943.' D. F. CORCORAN f 2,336,925

. FURNACE Filed Sept. 6, 19 11 2 Sheets-Sheet 1 INVEN'IOR.

D. F. CORCORAN FURNACE Filed Sept. 6, 1941 2 Sheets-Sheet 2 INVENTOR.

Patented Dec. 14, 1943 rars' 2 Claims.

My invention relates to furnaces, particularly hot air heating furnaces of that class which is constructed with an air-heating radiator through which the products of combustion pass from the heater of the furnace to the chimney, said radiator being provided to augment the heat-radiating surface of the furnace thereby to increase the efliciency of the latter.

My invention has for its object to provide a furnace of the class described with an improved radiator which will be of simple, efficient and inexpensive construction.

To this end I have provided a furnace of the class described equipped with an improved radiator which, in its preferred form, may be constructed and operate as set forth in the following description, the several novel features of the invention being separately pointed out in the claims at the close of the description.

In the accompanying drawings:

Figure l is a central vertical sectional View of a furnace constructed in accordance with this invention.

Figure 2 is a section on line 22 of Fig. 1.

The illustrated embodiment of my invention comprises a heater that is indicated generally at it and, as usual, said heater may be inclosed within a sheet metal casing l 8 provided adjacent to its bottom with the usual air inlet (not shown) and at its top with the usual air outlet fiues It. by which the heated air is distributed.

The fire-box it of heater iii supports the usual combustion dome i l made upon its exterior with a cylindrical nipple l5 surrounding the outlet it of the dome. Telescopically fitted upon the nipple i5 is a nipple I'i forming part of the inner wall of a hollow sheet metal lower radiator section or manifold l3 into which the products of combustion are directed from dome M3 by the two nipples l5 and H.

The lower radiator section it is of horseshoe shape, as viewed in plan, and surrounds the heater iii as shown in Fig. 2, being spaced away from said heater so as to provide an air passage between the two as shown. The dome outlet P5 is connected with the middle of this horseshoeshaped section it! and therefore the products of combustion that are discharged into section l8 will, upon entering said section, be divided. part thereof passing through each branch lfia of section It to the end of said branch. Each branch I8a is provided at its top and adjacent to its end with an outlet connected by an upwardly extending conduit it with the interior of an elongate sheet metal manifold'Zil forming part of an upper radiator section that is indicated generally at 2!.

This upper radiator section also includes a second elongate sheet metal manifold 22 that is disposed opposite to and parallel with the manitold 25 with which latter it is connected by an approximately horizontal row of sheet metal pipes'or conduits 23a and 23?). Upon the eX-- terior of the outer side of manifold 22 the latter is made with a cylindrical nipple 24 surrounding an outlet 25 provided in said side. This nipple 24 extends through an aperture provided in casing H to the exterior of the latter where it is telescopically fitted within a chimney flue 2%.

Each conduit i9, Fig. 1, consists in part of a flanged nipple 2'! that is an integral part of the lower radiator section 58 and in part of a flanged nipple 28 that is an integral part of the manifold 2!! of the upper radiator section, the flanges of said nipples abutting and being fastened to gether by bolts 29.

The manifold I8 is supported by the nipple I5 of dome l4 and is provided upon its top side and at the middle thereof, with an integral post 38 which'serves as a support for the manifold 22 of the upper radiator section 2i.

Each branch of the horseshoe-shaped manifold it is provided adjacent to its end, and upon the outer sidethereof, with an integral tubular clean-out nipple 3i projecting through an aperture formed in the casing H to the exterior of the latter, the inner end of said nipple communicating with the interior of manifold is and the outer end thereof being normally closed by a plate 32 separably interlocked with supporting hooks 33 projecting from the nipple 3!.

The up-draft within the chimney, supplemented by the relatively high temperature of the gases Within dome is of the heater, causes the products of combustion to discharge rom the latter into manifold 58 at the middle thereof, and to proceed thence through both branches of said manifold to and through conduits is into manifold 20, and thence through pipes 23a and 23b to manifold 22 from which they are delivered into the chimney flue 26 through nipple 2r. Since all of the manifolds, conduits and nipples of the radiator are preferably made from thin sheet metal integrated by welding, or otherwise, they quickly absorb heat from the products of combustion and also quickly transmit said heat to the air within casing H which rises to I the outlet flues l2. During its upward movement the air within casing H passes around all into two compartments one of which is connected by one of the conduits IS with one branch of. a manifold l8 and the other of which is connected with the other branch of said manifold by the other conduit I9. The set of pipes 23a communiq cate with one of these compartments while'the' set of pipes 231) communicate with the other com partment. The purpose of this partition34 isto ensure uniformity, as far as possible,of the flow of the hot gases through the branches i8 and l8a of manifold l8 and the pipes of both sets 23a and 23b.

As shown in Fig. 1 the top walls of the branches l8a of lower section It} and the pipe conduits of the upper section 2| are inclined upwardly toward their outlet ends thus taking advantage of the tendency of the heated gases to rise to-amplify the draft effects. r

The radiator structure constructed and arranged-as above described issupported mainly by a bail-shaped bracket 35 extending over the top of dome I4 and spot welded at its middle to the latter so that it is an integral part thereof. The opposite ends of this bracket are'formed with horizontal lateral extensions 36 which provide seats on which the branches lBa of lower section I8 rest. 1

What I claim is:

l. The combination with a casing and a heater within said casing having a lateral outlet for the products of combustion, of a radiator comprising a lower section consisting of a manifold having an inlet adjacent to its middle that is connected with said heater outlet and also having two branches thereof extending in opposite directions from said inlet around said heater, each branch being made adjacent to its extremity with an outlet, and said radiator also comprising an upper section that is spaced away from said casing and said lower section so that it is surrounded by the air that is within the casing, said upper section consisting of a pair of elongate relatively parallel spaced apart manifolds rigidly connected together by a horizontal row of spaced apart pipe conduits connecting the interiors of said pair and disposed above said heater, one manifold of said pair being made adjacent to its opposite ends with inlets and the other manifold of said pair being made with an outlet adapted to be connected with a chimney, and conduits connecting said inlets with the outlets of said branches.

2. The combination with a heater having a lateral outlet for the products of combustion, of a radiator comprising a lower section consisting of a manifold having an inlet adjacent to its middle that is connected with said heater outlet and also having two branches thereof extending in opposite directions from said inlet around said heater, each branch being made adjacent to its extremity with an outlet, and said radiator also comprising an upper section consisting of a pair of elongate relatively parallel spaced apart manifolds rigidly connected together by an approximately horizontal row of spaced apart pipe conduits connecting the interiors of said pair and disposed above said heater, said pipe conduits being inclined upwardly toward their outlet ends and one manifold of said pair being made adjacent to its opposite ends with inlets and the other manifold of said pair being made with an outlet adapted to be connected with a chimney, and conduits connecting said inlets with the outlets of said branches, the tops of the latter being inclined upwardly toward their outlet ends.

DANIEL F. CORCORAN. 

